On April 9th and 10th, 2008, Oklahoma was impacted by an intense storm system that brought flooding, straight line winds, hail and tornadoes to the state. The severe weather was caused by an intense upper level storm system that moved out of the southern Rockies and across the region. Gulf moisture moved north into parts of eastern and southern Oklahoma, causing more intense supercell storms to develop, and these caused substantial wind damage and a couple of tornadoes. North of the warm front, excessive rainfall developed, with many locations from southwest into central Oklahoma receiving more than four inches of rain in a 24 hour period. This led to flash flooding as well as river flooding, forcing roads to close and evacuations of some residents in Logan County.